CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total	Common Stock	Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2024			$ 49,187	$ 147,940	$ 3,861,073	$ (243,225)	$ (1,365,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		$ 222,398			222,398
Other comprehensive income (loss), net of tax		75,108				75,108
Dividends declared					(16,974)
Restricted stock				(11,287)			11,287
Employee stock purchase plan				3,657			2,324
Share-based compensation				10,410			74
Repurchases of common stock	[1]						(35,075)
Other				(1,070)			1,069
Ending Balance at Jun. 30, 2025			49,187	149,650	4,066,497	(168,117)	(1,385,497)
Beginning Balance at Dec. 31, 2024			49,187	147,940	3,861,073	(243,225)	(1,365,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss), net of tax		69,413
Ending Balance at Dec. 31, 2025		2,533,574	49,187	165,014	4,310,680	(173,812)	(1,817,495)
Beginning Balance at Mar. 31, 2025			49,187	145,217	3,954,481	(224,287)	(1,365,451)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		121,061			121,061
Other comprehensive income (loss), net of tax		56,170				56,170
Dividends declared					(9,045)
Share-based compensation				5,213			0
Repurchases of common stock	[1]						(20,825)
Other				(780)			779
Ending Balance at Jun. 30, 2025			49,187	149,650	4,066,497	(168,117)	(1,385,497)
Beginning Balance at Dec. 31, 2025		2,533,574	49,187	165,014	4,310,680	(173,812)	(1,817,495)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		279,354			279,354
Other comprehensive income (loss), net of tax		(16,157)				(16,157)
Dividends declared					(18,472)
Restricted stock				(13,681)			13,681
Employee stock purchase plan				4,457			2,024
Share-based compensation				14,241			64
Repurchases of common stock	[1]						(29,225)
Other				(1,050)			1,050
Ending Balance at Jun. 30, 2026		2,769,860	49,187	168,981	4,571,562	(189,969)	(1,829,901)
Beginning Balance at Mar. 31, 2026			49,187	162,326	4,429,993	(194,028)	(1,815,633)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings		151,168			151,168
Other comprehensive income (loss), net of tax		4,059				4,059
Dividends declared					(9,599)
Share-based compensation				7,113			7
Repurchases of common stock	[1]						(14,733)
Other				(458)			458
Ending Balance at Jun. 30, 2026		$ 2,769,860	$ 49,187	$ 168,981	$ 4,571,562	$ (189,969)	$ (1,829,901)

[1] For the three and six months ended June 30, 2026, the Corporation repurchased approximately 20,000 and 42,000 shares of its common stock, respectively. For the three and six months ended June 30, 2025, the Corporation repurchased approximately 60,000 and 102,000 shares of its common stock, respectively.